Start on the 'brick' api topics (#280)

* Start on the 'brick' api topics

* Add the delay to clear screen example

* Better output for clearsceen example

docs/reference/brick/show-number.md

@@ -0,0 +1,24 @@
+# show Number
+
+Show a number on the screen at the line you select.
+
+```sig
+brick.showNumber(0, 1);
+```
+
+## Parameters
+
+**value**: a [number](/types/number) to show on the brick's screen.
+**line**: The line number on the screen where the value is displayed. The line numbers for the screen start with line `1`.
+
+## Example
+
+Show the number `1000` on the screen.
+
+```blocks
+brick.showNumber(1000, 1);
+```
+
+## See also
+
+[show string](/reference/brick/show-string), [show value](/reference/brick/show-value)